function Data () {

	this.max =function  (num1,num2) {
		if(num1>num2){
			return num1;
		}else{
			return num2;
		}
	}
	this.cheji = function  (num) {
		return num*2;
	}

	this.jiuo = function(num){
		if(num%2!=0){
			return "奇数";
		}else{
			return "偶数";
		}
	}
}